Source: http://www.abarim-publications.com/Dictionary/l/l-w-te.html

לוט

The root-verb לוט (lut) means to wrap closely or to envelop. This verb occurs just a few times. Sometimes it simply denotes the wrapping of an object — the sword of Goliath, whose name, strikingly, comes from a verb meaning to uncover (1 Samuel 21:9). Sometimes it serves to indicate gloom or suppression (Isaiah 25:7).